>> где вывод ip route?
> default via 192.168.1.10 dev eth0
> 192.0.0.0/8 via 192.168.1.10 dev eth0
> 192.0.0.0/8 via 192.168.1.20 dev eth0  scope link
> 192.0.0.0/8 dev eth3  proto kernel  scope link  src 192.168.1.20
> 192.0.0.0/8 dev eth2  proto kernel  scope link  src 192.168.2.20
> 192.0.0.0/8 dev eth1  proto kernel  scope link  src 192.168.3.20
> 192.168.0.0/24 dev eth0  proto kernel  scope link  src 192.168.1.20

man ip

scope SCOPE_VALUE
              the scope of the area where  this  address  is  valid.   The  available  scopes  are  listed  in  file
              /etc/iproute2/rt_scopes.  Predefined scope values are:

                      global - the address is globally valid.

                      site - (IPv6 only) the address is site local, i.e. it is valid inside this site.

                      link - the address is link local, i.e. it is valid only on this device.

                      host - the address is valid only inside this host.